<?php
/*
Copyright (c) 2005 Steven Armstrong <sa at c-area dot ch>
Copyright (c) 2009 Danilo Segan <danilo@kvota.net>

Drop in replacement for native gettext.

This file is part of PHP-gettext.

PHP-gettext is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

PHP-gettext is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with PHP-gettext; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/
/*
LC_CTYPE        0
LC_NUMERIC      1
LC_TIME         2
LC_COLLATE      3
LC_MONETARY     4
LC_MESSAGES     5
LC_ALL          6
*/

// LC_MESSAGES is not available if php-gettext is not loaded
// while the other constants are already available from session extension.
if (!defined('LC_MESSAGES')) {
	define('LC_MESSAGES',	5);
}

require('StreamReader.class.php');
require('gettext_reader.class.php');


// Variables

global $text_domains, $default_domain, $LC_CATEGORIES, $EMULATEGETTEXT, $CURRENTLOCALE;
$text_domains = array();
$default_domain = 'messages';
$LC_CATEGORIES = array('LC_CTYPE', 'LC_NUMERIC', 'LC_TIME', 'LC_COLLATE', 'LC_MONETARY', 'LC_MESSAGES', 'LC_ALL');
$EMULATEGETTEXT = 0;
$CURRENTLOCALE = '';

/* Class to hold a single domain included in $text_domains. */
class domain {
	var $l10n;
	var $path;
	var $codeset;
}

// Utility functions

/**
 * Return a list of locales to try for any POSIX-style locale specification.
 */
function get_list_of_locales($locale) {
	/* Figure out all possible locale names and start with the most
	* specific ones.  I.e. for sr_CS.UTF-8@latin, look through all of
	* sr_CS.UTF-8@latin, sr_CS@latin, sr@latin, sr_CS.UTF-8, sr_CS, sr.
	*/
	$locale_names = array();
	$lang = NULL;
	$country = NULL;
	$charset = NULL;
	$modifier = NULL;
	if ($locale) {
		if (preg_match("/^(?P<lang>[a-z]{2,3})"              // language code
		."(?:_(?P<country>[A-Z]{2}))?"           // country code
		."(?:\.(?P<charset>[-A-Za-z0-9_]+))?"    // charset
		."(?:@(?P<modifier>[-A-Za-z0-9_]+))?$/",  // @ modifier
		$locale, $matches)) {

			if (isset($matches["lang"])) $lang = $matches["lang"];
			if (isset($matches["country"])) $country = $matches["country"];
			if (isset($matches["charset"])) $charset = $matches["charset"];
			if (isset($matches["modifier"])) $modifier = $matches["modifier"];

			if ($modifier) {
				if ($country) {
					if ($charset)
					array_push($locale_names, "${lang}_$country.$charset@$modifier");
					array_push($locale_names, "${lang}_$country@$modifier");
				} elseif ($charset)
				array_push($locale_names, "${lang}.$charset@$modifier");
				array_push($locale_names, "$lang@$modifier");
			}
			if ($country) {
				if ($charset)
				array_push($locale_names, "${lang}_$country.$charset");
				array_push($locale_names, "${lang}_$country");
			} elseif ($charset)
			array_push($locale_names, "${lang}.$charset");
			array_push($locale_names, $lang);
		}

		// If the locale name doesn't match POSIX style, just include it as-is.
		if (!in_array($locale, $locale_names))
		array_push($locale_names, $locale);
	}
	return $locale_names;
}

/**
 * Utility function to get a StreamReader for the given text domain.
 */
function _get_reader($domain=null, $category=5, $enable_cache=true) {
	global $text_domains, $default_domain, $LC_CATEGORIES;
	if (!isset($domain)) $domain = $default_domain;
	if (!isset($text_domains[$domain]->l10n)) {
		// get the current locale
		$locale = _setlocale(LC_MESSAGES, 0);
		$bound_path = isset($text_domains[$domain]->path) ?
		$text_domains[$domain]->path : './';
		$subpath = $LC_CATEGORIES[$category] ."/$domain.mo";

		$locale_names = get_list_of_locales($locale);
		$input = null;
		foreach ($locale_names as $locale) {
			$full_path = PHPDISK_ROOT.$bound_path . $locale . "/" . $subpath;
			if (file_exists($full_path)) {
				$input = new FileReader($full_path);
				break;
			}
		}

		if (!array_key_exists($domain, $text_domains)) {
			// Initialize an empty domain object.
			$text_domains[$domain] = new domain();
		}
		$text_domains[$domain]->l10n = new gettext_reader($input,
		$enable_cache);
	}
	return $text_domains[$domain]->l10n;
}

/**
 * Returns whether we are using our emulated gettext API or PHP built-in one.
 */
function locale_emulation() {
	global $EMULATEGETTEXT;
	return $EMULATEGETTEXT;
}

/**
 * Checks if the current locale is supported on this system.
 */
function _check_locale_and_function($function=false) {
	global $EMULATEGETTEXT;
	if ($function and !function_exists($function))
	return false;
	return !$EMULATEGETTEXT;
}

/**
 * Get the codeset for the given domain.
 */
function _get_codeset($domain=null) {
	global $text_domains, $default_domain, $LC_CATEGORIES;
	if (!isset($domain)) $domain = $default_domain;
	return (isset($text_domains[$domain]->codeset))? $text_domains[$domain]->codeset : ini_get('mbstring.internal_encoding');
}

/**
 * Convert the given string to the encoding set by bind_textdomain_codeset.
 */
function _encode($text) {
	$target_encoding = _get_codeset();
	if (function_exists("mb_detect_encoding")) {
		$source_encoding = mb_detect_encoding($text);
		if ($source_encoding != $target_encoding)
		$text = mb_convert_encoding($text, $target_encoding, $source_encoding);
	}
	return $text;
}


// Custom implementation of the standard gettext related functions

/**
 * Returns passed in $locale, or environment variable $LANG if $locale == ''.
 */
function _get_default_locale($locale) {
	if ($locale == '') // emulate variable support
	return getenv('LANG');
	else
	return $locale;
}

/**
 * Sets a requested locale, if needed emulates it.
 */
function _setlocale($category, $locale) {
	global $CURRENTLOCALE, $EMULATEGETTEXT;
	if ($locale === 0) { // use === to differentiate between string "0"
		if ($CURRENTLOCALE != '')
		return $CURRENTLOCALE;
		else
		// obey LANG variable, maybe extend to support all of LC_* vars
		// even if we tried to read locale without setting it first
		return _setlocale($category, $CURRENTLOCALE);
	} else {
		if (function_exists('setlocale')) {
			$ret = setlocale($category, $locale);
			if (($locale == '' and !$ret) or // failed setting it by env
			($locale != '' and $ret != $locale)) { // failed setting it
				// Failed setting it according to environment.
				$CURRENTLOCALE = _get_default_locale($locale);
				$EMULATEGETTEXT = 1;
			} else {
				$CURRENTLOCALE = $ret;
				$EMULATEGETTEXT = 0;
			}
		} else {
			// No function setlocale(), emulate it all.
			$CURRENTLOCALE = _get_default_locale($locale);
			$EMULATEGETTEXT = 1;
		}
		// Allow locale to be changed on the go for one translation domain.
		global $text_domains, $default_domain;
		if (array_key_exists($default_domain, $text_domains)) {
			unset($text_domains[$default_domain]->l10n);
		}
		return $CURRENTLOCALE;
	}
}

/**
 * Sets the path for a domain.
 */
function _bindtextdomain($domain, $path) {
	global $text_domains;
	// ensure $path ends with a slash ('/' should work for both, but lets still play nice)
	if (substr(php_uname(), 0, 7) == "Windows") {
		if ($path[strlen($path)-1] != '\\' and $path[strlen($path)-1] != '/')
		$path .= '\\';
	} else {
		if ($path[strlen($path)-1] != '/')
		$path .= '/';
	}
	if (!array_key_exists($domain, $text_domains)) {
		// Initialize an empty domain object.
		$text_domains[$domain] = new domain();
	}
	$text_domains[$domain]->path = $path;
}

/**
 * Specify the character encoding in which the messages from the DOMAIN message catalog will be returned.
 */
function _bind_textdomain_codeset($domain, $codeset) {
	global $text_domains;
	$text_domains[$domain]->codeset = $codeset;
}

/**
 * Sets the default domain.
 */
function _textdomain($domain) {
	global $default_domain;
	$default_domain = $domain;
}

/**
 * Lookup a message in the current domain.
 */
function _gettext($msgid) {
	$l10n = _get_reader();
	return _encode($l10n->translate($msgid));
}

/**
 * Alias for gettext.
 */
function __($msgid) {
	return _gettext($msgid);
}

/**
 * Plural version of gettext.
 */
function _ngettext($singular, $plural, $number) {
	$l10n = _get_reader();
	return _encode($l10n->ngettext($singular, $plural, $number));
}

/**
 * Override the current domain.
 */
function _dgettext($domain, $msgid) {
	$l10n = _get_reader($domain);
	return _encode($l10n->translate($msgid));
}

/**
 * Plural version of dgettext.
 */
function _dngettext($domain, $singular, $plural, $number) {
	$l10n = _get_reader($domain);
	return _encode($l10n->ngettext($singular, $plural, $number));
}

/**
 * Overrides the domain and category for a single lookup.
 */
function _dcgettext($domain, $msgid, $category) {
	$l10n = _get_reader($domain, $category);
	return _encode($l10n->translate($msgid));
}
/**
 * Plural version of dcgettext.
 */
function _dcngettext($domain, $singular, $plural, $number, $category) {
	$l10n = _get_reader($domain, $category);
	return _encode($l10n->ngettext($singular, $plural, $number));
}

/**
 * Context version of gettext.
 */
function _pgettext($context, $msgid) {
	$l10n = _get_reader();
	return _encode($l10n->pgettext($context, $msgid));
}

/**
 * Override the current domain in a context gettext call.
 */
function _dpgettext($domain, $context, $msgid) {
	$l10n = _get_reader($domain);
	return _encode($l10n->pgettext($context, $msgid));
}

/**
 * Overrides the domain and category for a single context-based lookup.
 */
function _dcpgettext($domain, $context, $msgid, $category) {
	$l10n = _get_reader($domain, $category);
	return _encode($l10n->pgettext($context, $msgid));
}

/**
 * Context version of ngettext.
 */
function _npgettext($context, $singular, $plural) {
	$l10n = _get_reader();
	return _encode($l10n->npgettext($context, $singular, $plural));
}

/**
 * Override the current domain in a context ngettext call.
 */
function _dnpgettext($domain, $context, $singular, $plural) {
	$l10n = _get_reader($domain);
	return _encode($l10n->npgettext($context, $singular, $plural));
}

/**
 * Overrides the domain and category for a plural context-based lookup.
 */
function _dcnpgettext($domain, $context, $singular, $plural, $category) {
	$l10n = _get_reader($domain, $category);
	return _encode($l10n->npgettext($context, $singular, $plural));
}



// Wrappers to use if the standard gettext functions are available,
// but the current locale is not supported by the system.
// Use the standard impl if the current locale is supported, use the
// custom impl otherwise.

function T_setlocale($category, $locale) {
	return _setlocale($category, $locale);
}

function T_bindtextdomain($domain, $path) {
	if (_check_locale_and_function()) return bindtextdomain($domain, $path);
	else return _bindtextdomain($domain, $path);
}
function T_bind_textdomain_codeset($domain, $codeset) {
	// bind_textdomain_codeset is available only in PHP 4.2.0+
	if (_check_locale_and_function('bind_textdomain_codeset'))
	return bind_textdomain_codeset($domain, $codeset);
	else return _bind_textdomain_codeset($domain, $codeset);
}
function T_textdomain($domain) {
	if (_check_locale_and_function()) return textdomain($domain);
	else return _textdomain($domain);
}
function T_gettext($msgid) {
	if (_check_locale_and_function()) return gettext($msgid);
	else return _gettext($msgid);
}
function T_($msgid) {
	if (_check_locale_and_function()) return _($msgid);
	return __($msgid);
}
function T_ngettext($singular, $plural, $number) {
	if (_check_locale_and_function())
	return ngettext($singular, $plural, $number);
	else return _ngettext($singular, $plural, $number);
}
function T_dgettext($domain, $msgid) {
	if (_check_locale_and_function()) return dgettext($domain, $msgid);
	else return _dgettext($domain, $msgid);
}
function T_dngettext($domain, $singular, $plural, $number) {
	if (_check_locale_and_function())
	return dngettext($domain, $singular, $plural, $number);
	else return _dngettext($domain, $singular, $plural, $number);
}
function T_dcgettext($domain, $msgid, $category) {
	if (_check_locale_and_function())
	return dcgettext($domain, $msgid, $category);
	else return _dcgettext($domain, $msgid, $category);
}
function T_dcngettext($domain, $singular, $plural, $number, $category) {
	if (_check_locale_and_function())
	return dcngettext($domain, $singular, $plural, $number, $category);
	else return _dcngettext($domain, $singular, $plural, $number, $category);
}

function T_pgettext($context, $msgid) {
	if (_check_locale_and_function('pgettext'))
	return pgettext($context, $msgid);
	else
	return _pgettext($context, $msgid);
}

function T_dpgettext($domain, $context, $msgid) {
	if (_check_locale_and_function('dpgettext'))
	return dpgettext($domain, $context, $msgid);
	else
	return _dpgettext($domain, $context, $msgid);
}

function T_dcpgettext($domain, $context, $msgid, $category) {
	if (_check_locale_and_function('dcpgettext'))
	return dcpgettext($domain, $context, $msgid, $category);
	else
	return _dcpgettext($domain, $context, $msgid, $category);
}

function T_npgettext($context, $singular, $plural, $number) {
	if (_check_locale_and_function('npgettext'))
	return npgettext($context, $singular, $plural, $number);
	else
	return _npgettext($context, $singular, $plural, $number);
}

function T_dnpgettext($domain, $context, $singular, $plural, $number) {
	if (_check_locale_and_function('dnpgettext'))
	return dnpgettext($domain, $context, $singular, $plural, $number);
	else
	return _dnpgettext($domain, $context, $singular, $plural, $number);
}

function T_dcnpgettext($domain, $context, $singular, $plural,
$number, $category) {
	if (_check_locale_and_function('dcnpgettext'))
	return dcnpgettext($domain, $context, $singular,
	$plural, $number, $category);
	else
	return _dcnpgettext($domain, $context, $singular,
	$plural, $number, $category);
}



// Wrappers used as a drop in replacement for the standard gettext functions

if (!function_exists('gettext')) {
	function bindtextdomain($domain, $path) {
		return _bindtextdomain($domain, $path);
	}
	function bind_textdomain_codeset($domain, $codeset) {
		return _bind_textdomain_codeset($domain, $codeset);
	}
	function textdomain($domain) {
		return _textdomain($domain);
	}
	function gettext($msgid) {
		return _gettext($msgid);
	}
	function _($msgid) {
		return __($msgid);
	}
	function ngettext($singular, $plural, $number) {
		return _ngettext($singular, $plural, $number);
	}
	function dgettext($domain, $msgid) {
		return _dgettext($domain, $msgid);
	}
	function dngettext($domain, $singular, $plural, $number) {
		return _dngettext($domain, $singular, $plural, $number);
	}
	function dcgettext($domain, $msgid, $category) {
		return _dcgettext($domain, $msgid, $category);
	}
	function dcngettext($domain, $singular, $plural, $number, $category) {
		return _dcngettext($domain, $singular, $plural, $number, $category);
	}
	function pgettext($context, $msgid) {
		return _pgettext($context, $msgid);
	}
	function npgettext($context, $singular, $plural, $number) {
		return _npgettext($context, $singular, $plural, $number);
	}
	function dpgettext($domain, $context, $msgid) {
		return _dpgettext($domain, $context, $msgid);
	}
	function dnpgettext($domain, $context, $singular, $plural, $number) {
		return _dnpgettext($domain, $context, $singular, $plural, $number);
	}
	function dcpgettext($domain, $context, $msgid, $category) {
		return _dcpgettext($domain, $context, $msgid, $category);
	}
	function dcnpgettext($domain, $context, $singular, $plural,
	$number, $category) {
		return _dcnpgettext($domain, $context, $singular, $plural,
		$number, $category);
	}
}

?>
